Eastham, M. S. P.; Unsworth, K. The deficiency indices and spectrum associated with self-adjoint differential expressions having complex coefficients. (English) Zbl 0238.34031 Conf. Theory ordinary partial diff. Equ., Dundee/Scotland 1972, Lect. Notes Math. 280, 241-245 (1972). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page MSC: 34L99 Ordinary differential operators 34E05 Asymptotic expansions of solutions to ordinary differential equations × Cite Format Result Cite Review PDF